Improvement in belt-gearings



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Letters Patent No. 108,259, dated October 11, 1870.

IMPROVEMENT IN BELT-GEARINGS.

*wv-h* The Schedule referred to in these Letters Patent and making partof the lame box-friction; and, also, in a novel means for compensatingfor the stretching of the belting; and I do hereby declare that thefollowing specification, taken in connection with the drawing furnished,and forming a part of the same, is a true, clear and exact descriptionthereof'.

In the drawing- Figure l represents myimprovement in perspective.

Figurc'. represents the same in top view.

Figure 3 represents in detail the belt-tightening mechanism.

A is the driving-pulley.

B is the auxiliary pulley.

C is the driven pulley, which should be secured to the shaft of themechanism to be operated.

D is the belt. It passes under the driving-pulley, over the driven,under the auxiliary pulley, and around it, under the driven pulley,thence to the upper portion ofthe driving-pulley, where its ends areunited.

The auxiliary pulley B is mounted in boxes sustained by two arms, H,which are pivoted at their lower ends.

'E and E are elastic cushions, arranged in each case to engage with thatside of the pulley-box next to the driven pulley.

F and F are set-screws passing through'shoulders G, and arranged toengage with the elastic cushions E, and by means of which thecushionsmay be made to bear with more or less force against theswinging.

boxes of the auxiliary, pulley, and thus compensate for any ordinarystretching of the belt, and maintain a regular and even frictioual`contact with the suriace of the pulleys with which it engages.

By my improved mode of gearing, it becomes practicable to dispense withboxes at a point on the driven shaft near the pulley C, and, therefore,a vibratory or other movement may be'givcn tothe opposite end of theshai't, if desired, without seriously affecting in any manner itspractical operation.

In the drawing 'a round belt is shown. A flat belt may as well be used,with straightaced pulleys, in

which case a projecting collar, as shown, would he requisite midwayofthe face oi' the pulley C, in order toprevent the inner edges of thebelt from chaiing, 85e.

With my improvement iu belt-gearing a degree of power is communicated tothe driven pulley practicallyv equal'to double that resulting from theuse of a belt of the same capacity applied in the ordinary manner.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent?- 1. The improvedbelt-gearing herein described, cousisting of the driving-pulley A,auxiliary pulley B, and driven pulley C, combined and operated by thebeltconncction 1), arranged to embrace the driven pulley at oppositeperipheries, for the purposes specilied.

2. The pivoted bearings H, in combination with elastic cushions arrangedto bearwith pressure in opposition tothe tractile force, substantiallyas described, for the purpose specified;

GEORGE B. HAMLIN. Witnesses:

PHIL. F. LARNER, FRANK A. JACKSON.-

